section {
  width: 100%;
  height: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 4vh;
  margin-bottom: 10vh;
  position: relative;
}
section::after {
  content: "";
  display: block;
  position: absolute;
  bottom: -10vh;
  width: 100%;
  border-bottom: #a7a2a2 solid 0.5px;
}
.c1 {
  width: 1000px;
  height: 475px;
  position: relative;
  overflow: hidden;
}
.c1 > img {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}
.c2 {
  width: 1000px;
  height: 405px;
  margin-top: 4vh;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 21px;
}
.c2-2 {
  grid-row: span 2;
}
.c2-1 {
  width: 319px;
  height: 192px;
}
.c3 {
  margin-top: 5vh;
  width: 1000px;
  height: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 12px;
  border-bottom: #ccc 1px solid;
  color: #333;
}
.c4 {
  width: 1000px;
  height: auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 26px;
}
.c4a {
  display: flex;
  flex-direction: column;
  position: relative;
}
.c4-1 > a > img {
  width: 316px;
  height: 316px;
  object-fit: cover;
  display: block;
}

.c4-2-1 > a > img {
  width: 40px;
  height: 40px;
}
.c4-2-2 > img {
  width: 30px;
  height: 30px;
}
.c4-2 {
  margin-top: 10px;
  width: 100%;
  height: 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.c4-2-1,
.c4-2-2 {
  display: flex;
  align-items: center;
}
.c4-2-1 > a.brand-link {
  width: 216px;
  height: 40px;
  display: flex;
  align-items: center;
  text-decoration: none;
  color: inherit;
}
.c4-2-1 > a.brand-link > .brand-logo {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.c4-2-1 > a.brand-link > .brand-logo > img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.c4-2-1 > a.brand-link > .brand-name {
  flex: 1;
  margin-left: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 14px;
}
.c4-2-1 > a:last-child {
  margin-left: 0; /* 统一由 brand-link 内部控制间距 */
}
.c4-2-2 > a {
  margin-right: 7px;
}
.c5 {
  margin-top: 10vh;
  width: 1000px;
  height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.c5 > button {
  height: 50px;
  width: 150px;
  border: #333 4px solid;
  font-weight: 600;
  font-family: initial;
  font-style: italic;
  color: #353333;
}
.c5 > button:hover {
  background-color: #333;
  color: white;
}

.c4-3 {
  position: absolute;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 316px;
  height: 316px;
  background-color: #000000;
  gap: 16px;
  color: white;
  opacity: 0;
  top: 0;
  left: 0;
  z-index: 1;
  transition: opacity 0.2s ease;
  pointer-events: none;
}
.c4-3-1 {
  position: absolute;
  left: 25px;
  top: 25px;
  font-size: 20px;
  color: rgb(21, 63, 189);
  font-weight: 700;
  font-style: italic;
}
.c4-3-2 {
  font-size: 16px;
  width: 220px;
  text-align: center;
  line-height: 22px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.c4-3-3 {
  width: 260px;
  font-size: 12px;
  line-height: 18px;
}
.c4a:hover .c4-3 {
  opacity: 0.65;
}
